DNA 50 COOLANT POURING OUT OF NEW CYLINDER HEAD

[dna50]

iv tried everything to seal up my cylinder head to the bore since i done the rebuild. i even put a new cylinder head on as i thought mine maybe no good but stil the same. iv used the correct gaskets and torque settings and tightened in a criss cross pattern so its level. but still leaking. there doesnt seem to be anything on the bottom of the bore where the cylinder head seals up to it ie no damage its all clean. any ideas as thhis is drivin me nuts iv bought 3 sets of gaskets the same now.
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hsaeed

[SpannerMonkey]

Crack in the barrel (Specifically the water jacket) that only makes itself apparent under pressure? or maybe same goes for head? each time you put a new gasket on, do you scrape old stuff off? also, make sure the head/barrel isnt warped

[dna50]

nope its taken off carefully everytime the barrels all good its leaking from the sealing face its the outer edge of the barrell thats where its leaking from. so if anything there would be a crack on that face wouldnt there but theres nothing at all. iv used 1500 wet n dry to smooth it and dried it all off so it can seal properly but still the same.

what i did once was i put a lot of sealer on the bottom off the cylinder head with the gaskets and then put it on with the aswell and torqued it up and it stopped leaking when the bike warmed up and when the bike cooled down it would just come out in small drops.
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hsaeed

[SpannerMonkey]

Just because you can't see a crack doesnt mean it isnt there... trust me. ever seen a kitchen plate with the faintest of faint lines running through it where a crack has appeared? imagine trying to spot that on a used engine part.

[dna50]

but before i took the engine apart for the rebuild it wasnt leaking at all everything was fine? so could it still be cracked?
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hsaeed

[SpannerMonkey]

[dna50]

iv just put sum new seals on yday there like rubber orings even the headgasket is a rubber o ring would it be ok to use them again im gonna try use sealer on it like i did before?
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hsaeed

[SpannerMonkey]

the head gasket is a rubber O ring That just does not sound right to me but I havent worked on the little piaggio engines before.
That the gasket set?
https://www.adrenalin-pedstop.co.uk/p/Gasket_set_for_Piaggio_liquid_cooled_engine-1118.aspx

[dna50]

yep that it the red one is the headgasket and the black one is the outer gasket which seals the outer edge of the bore and the blue paper one is the base gasket which seals the bore down onto the engine casing. there quite thin anyway people say you should change them but i only put them on yday so im not sure.
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hsaeed

[SpannerMonkey]

So the red one is holding fine, but the water is getting past the black one? if that's the case, I'd check to see if the head is warped at all

[dna50]

yess thats it. its got a brand new genuine head on it
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hsaeed

[SpannerMonkey]

Barrel is main suspect then, check for warping all around the mating face of the O ring, warping, cracks... anything! Photos would be mega useful, preferably not camera phone ones either unless you have a decent phone

[baldy]

Why did you sand the gasket surfaces down?
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One day i will rule the world, just not today.

[dna50]

because of when i used sealer on it after i tuk the dried sealer off i wanted to get the dirt off it but 1500 grade with wet is very fine
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hsaeed

[Billing]

how did you rub it down with the 1500grit? just your fingers? or di you put the paper on a piece of glass and do it that way?
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[lukamon]

I suggest you're nipping the basket, they're bastards to keep in the grooves. I used drops of oil to hold the asket in its grooves while i put the head back on
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killa wrote: Im an ass man myself

[dna50]

my fingers but i done it lightly and used wd40 aswel. i used tiny dots of glue to hold the seals in place
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hsaeed

[Billing]

when you fitted the new head did you lap the barrel in? If not the surface may be very slightly warped, thus allowing it to leak. If you've put more pressure on/focused more on one spot you could have created a low spot which won't help.

What type of glue did you use? some can cause the rubber to harden, then crack and leak.

As said before you might have a crack in the water jacket in the cylinder, which expands under pressure and leaks.
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
"Hey copernicus! Why don't you navigate yourself to the back of the line with your feet and stand there with your shit."
BCF Eastern members map here ---> g.co/maps/2tm8b PM me to be added to it!

[dna50]

it was only rubbed very lightly with the 1500 wet n dry so i doubt it. normal super glue what else could i use to hold the seals in place?
would the cylinder be under pressure when the bike is warmed up? because its leakin as soon as i put the coolant in when the bike is cold?
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hsaeed

[P.]

[Pete.]

Supposing the cylinder face IS slightly warped:

1500 grit is for polishing metal, you'll wear through the paper before removing any significant amount of it. It's far too fine for what you're doing. Get some 320 or 400 grit sheets to flatten the surface then run it over some 600 to finish. Note that it won't take long to do.

Get a flat pane of glass and stick the sheet of wet&dry to it using just water. Use water as a lube, hold the sheet steady with one hand and put the cylinder down onto it and rub in a straight line, but turn the cylinder slightly every couple of strokes. Make sure you keep the cylinder fully face down.

If you can't get on with holding the sheet to the glass with just water, take a new dry sheet, clean & dry the glass and then give the back of the sheet a light dusting with hairspray, do the glass the same and stick them together when tacky.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[dna50]

alright could i do this to the actual cylinder face aswel?
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hsaeed

[Pete.]

Yes you can clean up any flat face. Are you sure there is not an o-ring groove that should have a ring in it?
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[P.]

[dna50]

yes thats exactly what iv got lol iv got an oring for head and another outer o ring. the head o ring is sealing up but the outer one isnt its leaking from the bottom of the head.
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hsaeed